Determinants Level 18: 3x3 sparse realistic (no timer). 3x3 cofactor boxes.
1. First cofactor box
1. First cofactor box
2. Second cofactor box
2. Second cofactor box
3. Third cofactor box
3. Third cofactor box
4. Add three boxes
4. Add three boxes
Skip to content Show the first entry times its 2x2 minor. Settle box 1; show the next 2x2 minor. Settle box 2; show the final 2x2 minor. Add the three signed box values.